/*
MIT License

Copyright (c) 2009 NewsGator Technologies Inc.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

/*
Class for handling tabbed, master/subordinate widgets.
*/
var NGTab_Class = function() {
	//private properties
	var _this = this;
	var ng_data = {};
	var selectedTabObj = null;

	//initialization specified properties
	this.contentId = null;
	this.tabConfigs = [];
	this.parentBuzz = null;

	//additional config properties
	this.cacheData = true; //cache widget data for inactive tabs?
	this.tabClass = "tab"; //CSS class for all tabs
	this.tabClassActive = "tab active"; //CSS class for active tabs
	this.templateLoadingId = null;  //What to show while loading a tab. Can be a DOM node ID, a javascript global variable name, or a literal string
	this.firstTabIndexSelected = 0;

	//controls how content panels are display
	//"single" - there is one panel, the content is cleared & replaced to show a new tab. Causes view events to be fired on every tab click
	//"multi" - a container div is created for each tab. Each tab is rendered once, thereafter it's shown & hidden. View is fired only on first tab click
	this.panelType = "single";

	//autorotation settings
	//Doing an aliased variable so it's a little easier to reference later and so it minifies better.
	var autoRotation = this.autoRotation = {
		enabled: false, //do autorotation?
		rotateDelay: 5000, //milliseconds between changing tabs
		pauseDelay: 60000 //milliseconds to pause for. negative value indicates to just stop rotation instead of pausing
	};

	//EVENT HOOKS============
	var events = {};
	/* available events: 
	preInitializeEvents
	postInitializeEvents
	preWireUpTabsEvents
	postWireUpTabsEvents
	preRenderBuzzEvents
	postRenderBuzzEvents
	postDeselectAllTabsEvents
	postHighlightTabEvents
	displayLoadingFailedEvents
	loadingTemplateNotSpecifiedEvents
	noConfigFoundEvents
	tabClickedEvents
	*/
	//END EVENT HOOKS========


	this.initialize = function(contentId, tabConfigArray, parentBuzzObj) {
		this.contentId = contentId;
		this.tabConfigs = tabConfigArray;
		this.parentBuzz = parentBuzzObj;

		executeEvents("preInitializeEvents");

		wireUpTabs(this);
		selectGivenTabByIndex(this, this.firstTabIndexSelected);

		if (autoRotation.enabled) {
			this.startAutoRotation();
		}

		executeEvents("postInitializeEvents");
	}

	var autoRotateTimerHandle = null;
	var autoRotatePauseHandle = null;
	var autoRotateEventsBound = false;
	this.startAutoRotation = function() {
		if (autoRotateTimerHandle == null) {
			autoRotateTimerHandle = setInterval(rotateToNextTab, autoRotation.rotateDelay);

			if (!autoRotateEventsBound) {
				this.addEvent("tabClickedEvents", function() {
					_this.pauseAutoRotation();
				});
				autoRotateEventsBound = true;
			}
		}
	}

	var rotateToNextTab = function() {
		var selectedIdx = _this.getSelectedTabIndex();
		selectedIdx++;

		if (selectedIdx >= _this.tabConfigs.length) {
			selectedIdx = 0;
		}

		selectGivenTabByIndex(_this, selectedIdx);
	}

	this.stopAutoRotation = function() {
		if (autoRotateTimerHandle != null) {
			clearInterval(autoRotateTimerHandle);
			autoRotateTimerHandle = null;
		}

		if (autoRotatePauseHandle != null) {
			clearTimeout(autoRotatePauseHandle);
			autoRotatePauseHandle = null;
		}
	}

	this.pauseAutoRotation = function() {
		this.stopAutoRotation();

		if (autoRotation.pauseDelay > 0) {
			autoRotatePauseHandle = setTimeout(
				function() {
					rotateToNextTab();
					_this.startAutoRotation();
				},
				autoRotation.pauseDelay
			);
		}
	}

	var wireUpTabs = function(_this) {
		executeEvents("preWireUpTabsEvents");

		for (x = 0; x < _this.tabConfigs.length; x++) {
			var tab = document.getElementById(_this.tabConfigs[x].tabId);
			if (tab == null) { continue; }

			addOnClickEvent(tab, tabClicked, _this.tabConfigs[x].prependClickEvent);
		}

		executeEvents("postWireUpTabsEvents");
	}

	function tabClicked(evt) {
		executeEvents("tabClickedEvents");
		_this.changeBuzzEvent(evt);
	}

	function selectGivenTabByIndex(_this, index) {
		var config = _this.getConfigByIndex(index);
		if (config == null) { return; }

		tabObj = document.getElementById(config.tabId);
		if (tabObj == null) { return; }

		_this.changeBuzz(tabObj)
	}

	var highlightTabObject = function(_this, tabObj) {
		if (tabObj == null) { return; }

		deselectAllTabs(_this);
		tabObj.className = _this.tabClassActive;
		selectedTabObj = tabObj;

		executeEvents("postHighlightTabEvents", [tabObj]);
	}

	var deselectAllTabs = function(_this) {
		for (x = 0; x < _this.tabConfigs.length; x++) {
			var tab = document.getElementById(_this.tabConfigs[x].tabId);
			if (tab == null) { continue; }

			tab.className = _this.tabClass;
		}

		executeEvents("postDeselectAllTabsEvents");
	}

	this.getSelectedTabObject = function() {
		selectedTabObj = selectedTabObj || getItem(this.tabConfigs, function(config) {
			var tabObj = document.getElementById(config.tabId);
			return (tabObj && tabObj.className == _this.tabClassActive);
		});

		return selectedTabObj;
	}

	this.getSelectedTabIndex = function() {
		var selected = this.getSelectedTabObject();

		for (var i = 0; i < this.tabConfigs.length; i++) {
			if (this.tabConfigs[i].tabId == selected.id) {
				return i;
			}
		}
		return 0;
	}

	this.getConfigByBuzzId = function(buzzId) {
		return getItem(this.tabConfigs, function(config) {
			return (config.buzzId == buzzId);
		});
	}

	this.getConfigByIndex = function(index) {
		return this.tabConfigs[index] || null;
	}

	//NOTE: this will return the first one that it finds 
	//it's possible to have the same tabId declared more than once
	this.getConfigByTabId = function(tabId) {
		return getItem(this.tabConfigs, function(config) {
			return (config.tabId == tabId);
		});
	}

	function getItem(arr, filterFunc) {
		for (var i = 0; i < arr.length; i++) {
			var item = arr[i];
			if (filterFunc(item)) {
				return item;
			}
		}
		return null;
	}

	this.changeBuzzEvent = function(evt) {
		evt = evt || window.event;
		var obj = evt.target || evt.srcElement;
		this.changeBuzz(obj);
	}

	this.changeBuzz = function(sourceObj) {
		var config = this.getConfigByTabId(sourceObj.id);

		if (config == null) {
			executeEvents("noConfigFoundEvents");
			return;
		}

		highlightTabObject(this, sourceObj);

		if (config.renderBuzz) {
			this.displayLoading();

			var dataLoaded = (this.cacheData ? this.buzzIsLoaded(config.buzzId) : false);

			if (!dataLoaded) {
				var targetId = this.contentId;

				if (this.panelType == "multi") {
					targetId = config.panelId = "tabPanel_" + Math.random().toString().substring(2);

					var panel = document.createElement("DIV");
					panel.id = config.panelId;
					panel.className = "ng_tabPanel";
					//panel.style.display = "none";
					panel.innerHTML = getLoadingMessage();

					document.getElementById(this.contentId).appendChild(panel);
				}

				//load buzz object
				var self = this;
				function postCreateCallback(args) {
					var buzz = args.buzzObj;

					ng_data["buzz_" + config.buzzId] = buzz;
					self.renderBuzz(config.buzzId, config);
				}

				var extraArgs = ng_clone(config.extraArgs) || {};
				extraArgs.templateId = config.templateId;

				this.parentBuzz.loadSubordinateWidget(config.buzzId, targetId, extraArgs, postCreateCallback);
			}
			else if (this.panelType == "single") {
				//use cached data
				this.renderBuzz(config.buzzId, config);
			}

			if (this.panelType == "multi") {
				var contentContainer = document.getElementById(this.contentId);
				for (var i = 0; i < contentContainer.childNodes.length; i++) {
					var node = contentContainer.childNodes[i];
					if (node.style) {
						node.style.display = "none";
					}
				}
				document.getElementById(config.panelId).style.display = "block";
			}

		} else {
			//We're not actually rendering the tab content, so just call the events
			executeEvents("preRenderBuzzEvents", [null, config]);
			executeEvents("postRenderBuzzEvents", [null, config]);
		}
	}

	this.renderBuzz = function(buzzId, config) {
		if (!this.buzzIsLoaded(buzzId)) { return; }

		var buzzObj = ng_data["buzz_" + buzzId];

		//pre render buzz event
		executeEvents("preRenderBuzzEvents", [buzzObj, config]);

		//use the built in renderer
		buzzObj.render();

		//post render buzz event
		executeEvents("postRenderBuzzEvents", [buzzObj, config]);
	}

	this.setContents = function(value) {
		var contents = document.getElementById(this.contentId);

		if (contents != null) {
			contents.innerHTML = value;
		}
	}

	this.displayLoading = function() {
		if (this.panelType == "multi") {
			return;
		}

		var loadingMessage = getLoadingMessage();

		if (loadingMessage == null) {
			executeEvents("loadingTemplateNotSpecifiedEvents");
			return;
		}

		var contents = document.getElementById(this.contentId);
		if (contents != null) {
			//clear it out
			this.setContents("");
			contents.innerHTML = loadingMessage;
		}
		else {
			executeEvents("displayLoadingFailedEvents");
		}
	}

	function getLoadingMessage() {
		if (!_this.templateLoadingId) {
			return null;
		}

		//NOTE: loading template does not get parsed by trimpath
		var templateElement = document.getElementById(_this.templateLoadingId);
		var template = (templateElement ? templateElement.value || templateElement.innerHTML : null) ||
						(typeof window[_this.templateLoadingId] != "undefined" ? window[_this.templateLoadingId] : null) ||
						_this.templateLoadingId;
		return template;
	}

	this.buzzIsLoaded = function(buzzId) {
		if (ng_data["buzz_" + buzzId] == undefined || ng_data["buzz_" + buzzId] == null) return false;
		return true;
	}

	this.removeEvents = function(eventName) {
		events[eventName] = null;
	}

	this.addEvent = function(eventName, action) {
		events[eventName] = events[eventName] || [];
		events[eventName].push(action);
	}

	//internal method
	var executeEvents = function(eventName, arrEventArgs) {
		if (events[eventName]) {
			var arrEvents = events[eventName];
			for (var i = 0; i < arrEvents.length; i++) {
				try {
					var func = arrEvents[i];
					func.apply(_this, arrEventArgs || []);
				} catch (e) {
					debug("Error executing event " + eventName, e);
				}
			}
		}
	}

	var addOnClickEvent = function(obj, action, prepend) {
		var oldEvent = obj.onclick;
		if (typeof oldEvent != "function") {
			obj.onclick = function(evt) { action(evt); }
		}
		else {
			//see if we should add it before or after existing onclick events
			if (prepend == true) {
				obj.onclick = function(evt) {
					action(evt);
					oldEvent(evt);
				}
			}
			else {
				obj.onclick = function(evt) {
					oldEvent(evt);
					action(evt);
				}
			}
		}
	}

	var debug = function() {
		if (ng_debug) {
			return ng_debug;
		} else if (typeof console != "undefined") {
			return console.debug || console.log || console.warn || function() { };
		}
		return function() { };
	} ();
}

var NGTabConfig_Class = function(buzzId, tabId, templateId, extraArgs)
{
	//Public constructor properties
	this.templateId = templateId;
	this.tabId = tabId;
	this.buzzId = buzzId;

	//Optional public properties
	this.prependClickEvent = false;
	
	//Optional property to not render a buzz (allows framework to be used as a generic tab framework)
	this.renderBuzz = true;
	
	//optional extra args to be passed into the child widget
	this.extraArgs = extraArgs;
}